James h



(No Model.)

J. H. GERRY.

PENDULUM REGULATOR FOR CLOCKS.

N0. 393,638. Patented NOV. 27, 1888.

UNITED STATES PATENT OFFICE.

JAMES H. GERRY, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE SELF YVINBING CLOCK COMPANY, OF SAME PLACE.

PENDULUM-REGULATO R FOR CLOCKS.

SPECIFICATION forming part of Letters Patent No. 393,638, dated November 27, 1888.

Application filed June I, 1888. Serial No. 275,741. (Yo modvl.)

pendulums for clock-movements.

The object of the invention is to provide a simple device for regulating the beat ofa pendulum by varying its length from the upper or suspended end.

The invention consists in supporting the pendulum upon acircular block which may be turned upon its axis in one direction or the other, thereby changingthelength of the pend ulum without altering its point of support.

The invention will be described more particularly in connection with the accompanying drawings, in which- Figure 1 illustrates the usual plan adopted, and Fig. 2 illustrates a modification.

Referring to Fig. 1, A represents a pond uluin-rod, and B the flat spring usually employed for supporting the same. This spring passes through a slit formed in a plate, 0, and this determines the practical length of the pendulum. The upper end of the spring is secured to a block, E. and this is supported by a flexible spring, B, or equivalent support. \Vh'en a fiat spring, B, is employed, its plane is at right angles to that of the spring B. The upper end of the spring B is fastened to a block or rocker, F, which is carried upon a pivot, f. The periphery of this block is in the are of a circle concentric with the point of support f. The spring B extends along the curved periphery of the block. It is evident that by turning the circular block F in one direction or the other the pendulum may be raised or lowered, the spring B sliding through the slit in the plate. For the purpose of thus adj usting the pendulum a screw, H, extends from any suitable pointas, for instance, the upper portion of the dial of the cloclthrcugh some portion of the frame, as at h, in which it turns. The inner end of this screw presses against a shoulder, 1', formed upon the block F. By turning the screw in one direction this shoulder is forced forward, thus raising the pendulum, and by turning the screw in the opposite direction the shoulder is allowed to approach the front of the clock, and thus the pendulum is allowed to drop. The outer end of the screw H may be square for the purpose of receiving a key to turn it.

In some instances it may be desired to adjust the pendulum from eitherside of the clock instead of the front, and this may be accomplished by securing the spring B directly to the block F, as shown in Fig. 2. The axis of movement of the block is then at right angles to that shown in Fig. 1, and the adjustment is made directly upon the spring B, the block E and spring B being dispensed with.

It is desirable that the portion of the spring B which is above the plate C should be as short as possible, and therefore the block is here shown as being placed quite near the plate. The length of the are formed by the periphery of the block F may be greater or less according to the range of adj ustmcnt desired.

Other methods of turning the block F upon its support may be devised withoutdeparting from the spirit of the invention; but the form here described is found very convenient in practice.

I claim as my invention 1. The combination, with a clock-pendulu m, of an adjustable support for the same, consisting of a block having a portion of its periphery formed in the are of a circle, a flexible support for the pendulum secured tosaid block and resting against the periphery thereof, and a device for turning the block about its center, substantially as described.

2. An adjustment forcloek-penduluins, con sisting of a block having its periphery formed in the are of a circle whose center is at the point of support of the block, a flexible support for the pendulum resting along the pe riphery of the block, and a threaded screw bearing against a shoulder formed upon the block and carried by the frame of the clock for turning the block upon its center, substantiall y as described.

3. An adjustment for clock-pendulums, consisting of a pivot-ed block having a portion of its periphery curved, a flexible spring for the pendulum, a plate having a slit through which said flexible spring passes, a block supporting said flexible spring, a second flexible spring whose plane is at right angles to the plane of the first-named spring secured at one end to said block and at the other to said pivoted support, and an adjustment for turning said pivoted support upon its center.

4. An adjustment for pendnlums, consisting of a curved rocker, a flexible support for the pendulum resting along the Face ofsaid rocker,

and an adjusting device for turning said rocker in its support.

In testimony whereof I have hereunto sub scribed my name this 3lst day of May, A. D. 1888.

JAMES H. GERRY. Witnesses:

DANL. W. EDGECOMR, CHARLES A. TERRY. 

